The dataset we used for experimentation is the CoNLL-2012 Shared Task English data [1]} based on the OntonNotes corpus. The training set contains 2,802 documents, and the validation set and test set contain 343 and 348 documents, respectively. Similar to the previous works, we use three different metrics: MUC [2]}, B\(^3\)  [3]} and CEAF\(_{\phi _4}\)  [4]}, and report the respective precision, recall and F1 scores.
